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Corrosion-resistant hot galvanized steel plate and preparation method thereof

A hot-dip galvanized steel sheet, corrosion-resistant technology, applied in the direction of hot-dip galvanizing process, coating, metal material coating process, etc. Poor corrosion performance and other issues

Active Publication Date: 2011-01-19
ZHEJIANG HUADA NEW MATERIAL
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Problems solved by technology

[0002] In the zinc coating of continuous hot-dip galvanized steel sheets, generally only a small amount of aluminum is added, such as 0.1% to 0.2% of aluminum. Such coating materials are likely to cause a lot of slag at the bottom of the zinc pot during production, and the surface of the galvanized sheet and sinking roll is easy to stick. Slag, spangle grains of the coating are easy to be too large, and the corrosion resistance of the coating is poor, resulting in quality problems

Method used

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Embodiment Construction

[0008] The present invention will be described in detail below in conjunction with specific embodiments: the hot-dip galvanized steel sheet of the present invention, it is made up of the cold-rolled steel sheet after the treatment and the galvanized layer that forms on the cold-rolled steel sheet surface by hot-dip galvanizing process, The galvanized layer contains 0.35-0.45% by weight of aluminum and 0.04-0.06% of ytterbium-rich rare earth, and the rest is original zinc material. Because part of the aluminum in the molten zinc combines with iron to form dross, and part of the aluminum is oxidized to Al on the surface of the molten zinc 2 o 3 A dense protective film, therefore, the raw zinc ingot for galvanized steel sheet contains 0.9-1.1% by weight of aluminum and 0.04-0.06% of ytterbium-rich rare earth.

[0009] A zinc coating as described above, which contains aluminum and rare earth hot-dip galvanized steel sheets, the processing method of which is: comprising the proces...

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Abstract

The invention relates to a corrosion-resistant hot galvanized steel plate and a preparation method thereof. The hot galvanized steel plate is formed by processing a cold rolled steel plate and forming a zinc coating on the cold rolled steel plate by a hot galvanizing process, wherein the zinc coating contains the following components in percentage by weight: 0.35-0.45% of aluminum and 0.04-0.06% of ytterbium-enriched rare earth. The method comprises the following steps: 1. carrying out cold-rolling on a hot rolled blooming base plate to form a cold rolled steel plate; 2. cleaning the cold rolled steel plate with alkali and water; 3. annealing the cleaned cold rolled steel plate; 4. carrying out hot galvanizing on the annealed plate in a galvanizing pot; 5. subsequently straightening and flattening the hot galvanized plate; and 6. passivating and greasing the flattened hot galvanized plate. By using the zinc alloy coating containing aluminum and rare earth, the invention ensures that the galvanizing pot has little bottom slag, the scum is reduced by 20%, the coating has fine adhesive capacity, and the corrosion resistance of the coating is improved by two times.

Description

technical field [0001] The invention relates to a corrosion-resistant hot-dip galvanized steel sheet and a preparation method thereof, in particular to a corrosion-resistant hot-dip galvanized steel sheet containing aluminum and rare earth in the coating and a preparation method thereof, belonging to the hot-dip galvanized steel sheet processing technology field. Background technique [0002] In the zinc coating of continuous hot-dip galvanized steel sheets, generally only a small amount of aluminum is added, such as 0.1% to 0.2% of aluminum. Such coating materials are likely to cause a lot of slag at the bottom of the zinc pot during production, and the surface of the galvanized sheet and sinking roll is easy to stick. Slag, spangle grains of the coating are easy to be too large, and the corrosion resistance of the coating is poor, resulting in quality problems. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/04C23C2/40
Inventor 张志良唐红军徐志军姜震宇
Owner ZHEJIANG HUADA NEW MATERIAL
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